11312212131 has 96 divisors (see below), whose sum is σ = 19718899200. Its totient is φ = 6169789440.

The previous prime is 11312212127. The next prime is 11312212157. The reversal of 11312212131 is 13121221311.

11312212131 is a `hidden beast` number, since 11 + 312 + 212 + 131 = 666.

It is not a de Polignac number, because 11312212131 - 2² = 11312212127 is a prime.

It is a super-2 number, since 2×11312212131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11312219131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3672450 + ... + 3675528.

It is an arithmetic number, because the mean of its divisors is an integer number (205405200).

Almost surely, 2^11312212131 is an apocalyptic number.

11312212131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11312212131 is a deficient number, since it is larger than the sum of its proper divisors (8406687069).

11312212131 is a wasteful number, since it uses less digits than its factorization.

11312212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209 (or 3206 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11312212131 its reverse (13121221311), we get a palindrome (24433433442).

The spelling of 11312212131 in words is "eleven billion, three hundred twelve million, two hundred twelve thousand, one hundred thirty-one".